Is it supposed to be off upon arrival? I have been tapping on the screen nonstop and nothing is working.

It was off when I received it. But then tapped in it after I put in on tank, and it worked

How long does a battery last?

Depends … how old the battery is, how often it gets used, exposure to elements… At ~$9.99 a unit probably easier and cheaper to replace unit than battery.

Thinking of using this in my aquaponics set up and wondering does it will work on the plastic IBC totes I keep the fish in?

I use it on my 20 gallon aquarium and it works greta. dont know if that will help you but I have a feeling it will work anywhere!

Can you change it to display in Celsius?

i didnt see anything on the box that says it changes

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🌊 Keep your aquatic friends comfy with precision and style!

CORDLESS SLEEK DESIGN - No wires, no clutter—just stick and go for a pristine tank setup
CRYSTAL CLEAR LED DISPLAY - Vibrant, wide-angle screen for effortless day & night reading
RAPID TEMPERATURE UPDATES - Refreshes every 5 seconds so you never miss a change
ENERGY SMART ECO FRIENDLY - Green tech with auto-sleep mode to save power and planet
UNIVERSAL WATER COMPATIBILITY - Perfect for freshwater, saltwater, and everything in between

The PAIZOO Fish Tank Digital Thermometer features a high-definition LED display with ±0.9°F accuracy, cordless touch activation, and a long-lasting 3V battery. Designed for easy stick-on installation outside the tank, it supports all water types and updates temperature readings every 5 seconds, ensuring a clean, safe, and perfectly monitored aquatic environment.